A flexible, form-shaped device designed to be placed over a patient's nose and/or mouth to direct anaesthetic gases to the upper airway. It is made of conductive or non-conductive rubber, polyvinyl chloride (PVC), or other sterilizable materials that produce a soft, flexible cover to create an airtight seal against the patient's face. It typically includes a 22 mm connector (adult) or a 15 mm connector (paediatric), and is available in a range of sizes. It may be stabilized with a headstrap. This device is sometimes used in association with a manual resuscitator. This is a single-use device.